Typewriting machine



Jan. 25, 1944.

E. L. WISE TYPEWRITING MACHINE Filed March 18, 1941 2 SheetsfSheet 1 ATTORNEY E. L. WISE TYPEWRITING MAQHINE Filed March 1s, 1941 Jan. 25,

2 Sheets-Sheet 2 K INVENTOR E/.MEA l.. W/SE ATT oRNav Patented Jan. 25, 1944 TYPEWRITING MACHINE Elmer L. Wise, Bridgeport, Conn., assignor to Underwood Elliott Fisher Company, New York, N. Y., a corporation of Delaware Application March 18, 1941, Serial No.-383,950

4 Claims.

This invention relates to typewriting machines and to typewriting and accounting machines of the Elliott Fisher type. Such machines are provided with a platen frame, a substantially flat platen mounted in said frame and, la line space frame mounted for forward and rearward movement on the platen frame over the platen. This invention relates more particularly to mechanisrn for moving the line space frame forwardly.

sired direction, the mechanism being restored to neutral position to throw out the drive by suitable springs upon release of the respective levers. The outward movement of the left hand lever connects the parts of the clutch to drive the line space frame rearwardly and the outward movement of the right hand lever connects theparts of the clutch to drive the line space frame forwardly- In the operation of machines of this type, the drive for the line; space frame is connected to drive said frame and the type head rearwardly far enough to release the work sheet, after the completion of the typing of -a piece of Work, so that said sheet may be readilyr removed from the platen. In prior machines, it is necessary for the operator to maintain pressure on theknee lever until said frame reaches the desired position. The operator, ordinarily watches the movement of said frame and releases the knee lever todisconnect the drive and cause the stoppage of the frame when the desired position is reached. This is very tiresome to the operator, especially where she has a large number of work sheets to be introduced and removed from the machine and a relatively small amount of typing to be done on each sheet. A safety cam is provided at the rear end of the platen frame to throw out the drive when the frame has reached an extreme position even though the operator maintains pressure on the knee lever. Y

The primary object of the present invention is to improve the construction and mode of operation `of the mechanism for controlling the drive of the line space frame in machines oi the Elliott Fisher type. n A

Another object of the invention is to provide machines of the above type with mechanism for controlling the engagement of the driving connections for driving the line space frame rearwardly which, after the driving mechanism is thrown into operation, will maintain the connections engaged until the line space frame reaches a predetermined position and will then cause said connections to be automatically disengaged to throw the drive out of operation.

Another object of the invention is to provide a construction, in machines of the above type, in which the engagement of parts of the driving mechanism to drive the line space frame forwardly and the engagement of the parts of said mechanism to drive said frame rearwardly may be controlled by a single hand operated lever.

With the above objects in view, the invention consists in a construction embodying the novel and improved features hereinafter described and particularly pointed out in the claims, the advantages of which will be readily understood and appreciated by those skilled in the art.

The invention will be clearly understood from the accompanying drawings illustrating the invention in its preferred form and the following detailed description of the construction therein shown.

In the drawings:

Fig. 1 is a plan view illustrating portions of the platen frame, platen and line space frame of a typewriting machine of the Elliott Fisher type having the invention embodied therein,

Fig. 2 is a detail plan view illustrating the left hand portions of the platen and platen frame of the machine and certain associated parts,

Fig. 3 is a view in side elevation of the mechanism shown in Fig. 2, looking from the left hand side of the machine,

Fig. 4 is a detail view in rear elevation illustrating, in full lines, the bail for controlling the driving connections for the line space frame and certain associated parts for controlling the position of the bail and, in dot and dash lines. certain parts of the driving connections for said frame, e

Fig. 5 is a view-inrear'elevation illustrating a portion of the mechanism shown in Fig. 4, with certain of the parts in different positions,

Fig. 6 is 4a View similar to Fig. 5, illustrating certain of the parts in still different positions,l and K Figs. 7 and 8 are detaill views illustrating cerin Figs. 4, 5

a typewriting machine having the same general construction as the machine illustrated and described in the Patent to Foothorap No. 1,904,127, dated April 18, 1933.

In the illustrated construction, the machine comprises a platen frame provided with side rails or bars 2 connected together in spaced relation by transverse or cross bars 3, 5 and 1 and a substantially flat platen 4 mounted for vertical movement in said frame. Upon the side rails 2 of the platen frame is supported a line space frame movable forwardly and rearwardly on tracks formed upon the upper edges of said rails to line space the type carriage with relation to the platen. The line space frame comprises side brackets or bars 6 connected by front and rear rails 8 and I0. The line space frame is provided with wheels or rollers I2 and I3 which engage respectively the upper edges of the rails 2 of the platen frame to enable the line space frame to move readily over the platen frame.

The mechanism for moving the line space frame comprises a shaft I4 rotatably mounted in bearings carried by the line space frame, the shaft extending substantially parallel with the front and rear rails of said frame. Upon the shaft are fixed gears I6 which mesh with the teeth of the racks I8 secured to the side rails 2 of the platen frame, these gears and the rollers i3 being secured together and preferably integral. The shaft I4 is rotated to impart a line spacing movement to the line space frame at the end of each return movement of the carriage by mechanism preferably having substantially the same construction, arrangement and mode of operation of parts as the corresponding mechanism illustrated and described in the copending application of applicant, Serial No. 214,009, filed June i6, 1938, upon which Patent No. 2,248,152, dated July 8, 1941, has been granted.

Mounted for lateral movement upon the front and rear rails 8 and I0 of the line space frame is a type carriage or head, not shown in this application. The forward and rearward movements of the line space'frame shift the type head to different positions with relation to the work sheets supported on the platen 4. x

The machine illustrated in the present application is provided with an electric driving motor illustrated in doti and dash lines in-Fig. 1 and indicated at 20. This motor is mounted on a suitable bracket secured to the line space frame with which it travels as shown in Foothorap Patent No. 1,904,127, referred to above. Except as above described, the various parts of the machine above referred to have substantially the same construction, arrangement and mode of op-V eration as corresponding parts of the machine illustrated and described in said Foothorap patent. The motor is provided with electrical connections (not shown) forming a circuit controlled by any suitable manually operated switch and the motor may be continuously driven. The motor is provided with a shaft 22 carrying a pulley 23 connected by a belt 24 with a pulley 25 journalled upon a fixed shaft 28 having its ends supported respectively in a socket in the upright extension 30 on the left hand member 6 of the line space frame and in bosses attachedrto the forward portions of the spaced frame plates 32 and 34 to which said shaft is secured. The plate 34 is mounted on a lateral extension 35 on the left hand member 5 of the line space frame to which it is secured and its rear end portion is connected, by one or more rods 38, 'with a plate 40 secured to the member 30 of the line space frame. The forward portion of the plate 32 is fixed'to the shaft 23 and its rear portion is fixed to the rods 38.

The pulley 25 is attached to a sleeve 42 upon which is mounted a spiral gear 44 meshing with a spiral gear 46 fixed to the shaft 48 rotatably mounted in bearings respectively in the extension 30 and in a bearing sleeve 50 secured to the plate 32. The shaft 48, which is longitudinally fixed in its bearings, is arranged to drive the longitudinally movable shaft 52 which is also mounted in suitable bearings carried by the line space frame and the driving connection between the shaft 48 and the shaft 52 is arranged to accommodate he longitudinal movement of the shaft 52. In the construction shown, a cross bar 54 is secured to the inner end of the shaft 4B and engages in a slot 56 formed between the projections 53 extending laterally from a disc 50 attached to the adjacent end of the longitudinally movable shaft 52.

The shaft I4 is driven in opposite directions from the shaft 52 under control of a manually operable or adjustable lever to advance and retract the line space frame over the platen. Thev driving connections between the shaft I4 and the shaft 52 comprise a gear 62 fixed to the shaft I4 and meshing with a gear 64 fixed to a clutch sleeve `I'ii rotatably mounted on the shaft 52 and held from longitudinal movement thereon by means of an arm 58 formed by an upturned portion of the bracket B9 secured to a frame plate 'I0 attached in any suitable manner t0 the line space frame, said arm engaging in a groove in the clutch sleeve. Said mechanism also includes a gear 'II fixed to the shaft I4, an idle pinion 'I2 iixed to a shaft 'I4 journaled, at one end, in a bearing T5 mounted on an upturned arm I6 on a bracket 'I'I secured to the plate 10. At its other end the shaft is journaled in a bearing 'I'Ia mounted on an .upturned arm 'I8 formed on the bracket 69. To the pinion 'I2 is secured a second pinion 80 meshing with a pinion 82 fixed to a clutch sleeve 84 journaled on the shaft 52 and held from longitudinal movement on the shaft by means of the arm I8 which engages a groove in the sleeve. A double clutch member 86 is fixed to the shaft 52 between said clutch sleeves and is arranged to be engaged respectively with the clutch sleeve 66 or the clutch sleeve 84 by the longitudinal movement of the shaft.

The shaft 52 is normally held in central or i neutral position, with the clutch member 83 disengaged from both-the clutch sleeves 66 and 84, by means of a centering device indicated as a whole at 88 and having substantially the same construction as the corresponding centering device illustrated and described in applicants Patent No. 2,248,152 referred to above. Briey described, this centering device comprises a centering lever 90 pivoted upon a stud 92 secured in a supporting plate 94 attached to the underside of the rear rail I0, the lever being locatedV beneath the supporting plate. The lever 00 Ais provided with `a slot 96 in its rear end in which engages a disc S8 fixed to the longitudinally movable shaft 52. A pin |00 is mounted in the forwardly extending arm of the lever 90 and projects upwardly therefrom through a'slot |02 ingtheplate 94. i Y Y The lever 90 is actedupon by two centering levers |04 and |06 both pivoted on the stud 92 and arranged to engage the pin |00 on opposite sides` thereof as clearly shown in Fig. \1. The lever |04 is acted upon by a coiled spring |08 and the lever |06 is acted upon by a coiled spring H0, these springs normally holding said levers in position in engagement or substantially in engagement with a centering pin ||2 xed to and projecting upwardly `from the plate 94 between said levers.

When -both levers are in engagement with the pin and in engagement or substantially in engagement with the pin H2, the lever 90 is held in position to center the longitudinally movable shaft and hold the same in position with the clutch member 35 disengaged from both the opposed clutch sleeves. When the shaft 52 is moved to the left to engage the clutch member 86 with the clutch sleeve 6'5, the lever 90 is swung in a counter-clockwise direction about the stud 92 and the lever |06 is swung therewith, the lever |04 being maintained substantially stationary in emgagement with pin H2. Upon the release of the shaft 52 the spring ||0 acts on the lever |06 to swing the lever 90 in a clockwise direction thereby moving the shaft 52 back to the right to clutch disengaging position. When shaft 52 is moved to the right to engage the clutch member 85 with the clutch sleeve 84, the lever S0 is swung in a clockwise direction and the lever |04 is swung therewith by the engagement with the lever of the pin |00, the lever |06 being maintained substantially stationary in engagement with the pin ||2. Upon the release of the shaft 52, the spring |08 swings the lever |04 and therewith the lever 90 back to normal position thereby again centering the shaft 52.

The shaft 52 is moved longitudinally to engage the clutch member B selectively with the clutch sleeves 5S and 84 to drive the line space forwardly or rearwardly `by means of the usual bail. This bail, shown in Figs. 1, 2 and 3 and indicated at ||4, extends along the left handside of the platen frame substantially parallel with the left hand rail and is arranged to engage in a peripheral groove in the disc 00 which is sccured to the left hand end of the shaft 52 as shown in Fig. l. This bail is mounted in the usual manner upon the upper ends of arms l l5, H8, and |22 secured at their lower ends to a forwardly and rearwardly extending rock shaft |24 mounted at its ends in bearings in brackets |25 and |28 secured to said rail. The rock shaft is arranged to be rocked in opposite directions to carry the bail toward and from the rail by means of a single manually operable lever |55 pivoted upon a stud |32L threaded into the rail and secured therein by means of a lock: nut |34. To connect the lever with the rock shaft, the lever is provided with a slot |35 in which engages a pin |38 extending laterally from a block fixed to the forward end of the rock shaft. The hand lever is provided at its forward end with a laterally extending projection |42 by which it may be readily operated manually.

With this construction, when the hand lever is in the central position shown in full lines in Fig. 3, the reci: shaft i 24 and the bail H4 are positioned so that the shaft 52 is located in central or neutral position, the driving mechanism for said shaft being disconnected. When it is desired to drive the line space frame in a forward direc-v tion, the hand lever |35 is swung downwardly substantially to the position A shown in dotted lines in Fig. 3, This movement of the hand lever swings the bail H4 away from the adjacent rail of the line space frame and the shaft 52 is moved longitudinally to the lef-.t (Fig. l). to engage. the clutch member 36 with the .clutch sleeve 65 to drive the line space frame in a forward direction. When it is desired to drive the line space frame in a rearward direction, the hand lever |30 isl moved upwardly to the position shown in dotted lines in Fig. 3 and indicated at B. This movement of the hand lever swings the bail I4 towards the adjacent rail of the line space frame and the shaft 52 is moved longitudinally to the right to engage the clutch member with the clutch sleeve 84 to drive the line space frame rear- Wardly.

The present machine is provided with mecha` nism which, when the hand lever |30 is moved upwardly to B position to engage the driving connections to drive the line space frame rearwardly,

will hold the driving connections engaged until the line space frame reaches a predetermined position in its rearward movement and the driving connections are then automatically disengaged to arrest the movement of the line space frame. The mechanism for controlling the driving connections are arranged, however, so that when the hand lever |30 is moveddownwardly to the position A to drive the line space frame forwardly, the driving connections will be maintained in engagement only as long as the hand lever is held by the operator in this position, the driving connections being immediately disengaged upon the release of the hand lever.

The mechanism for obtaining the above improved results comprises a lever |44 pivoted on a stud 45 secured in the cross bar 5 of the platen frame and an adjustable link |40 connecting said lever with a bracket |52 secured to the rock shaft |24. The lever |43 is provided at its lower end with a forward projecting pin |54, and is acted upon by a bell crank lever |56 pivoted on a stud i 5S secured in the crossbar 5, the horizontal arm of which bell crank lever is arranged to engage the pin |54. The lever |44 is also aotedupony by a second bell crank lever |60 pivoted on the stud |52 secured in the cross bar 5, the horizontal arm of which is also arranged to engage the pin |54. The levers |55 and 50 are connected by a coiled spring 54 which tends to swing said levers in opposite directions about their respective supporting studs and to maintain their horizontal arms in engagement with the pin |54.

Figs. 7 and 8 show clearly the shapes of the horizontal arms of the bell crank levers i55- and ite. The horizontal arm of the lever |55 is provided with an extension |55, the lower face |68 of which normally lies substantially parallel with a line connecting the axes of the two levers and with. a cam face H0 extending at an angle to the face its. Lever |55 is provided with an extension |72, the lower face |'i4 of which also extends normally substantially parallel with the line connecting the axes of the two levers. The lever |58 is also provided with an angular V-shaped projection H5 forming a recess Illa in said arm. The two levers are arranged with their horizontal arms in overlapping relation as shown in Figs. 4, 5 and and in the normal or clutch disengaged' position of the parts, the pin |54 on the lever- |44 is engaged between the inclined face |10 of the lever |55 and the left hand side of the V-shaped projection |15 on the lever |55 as shown in Fig. 4, When the bail ||4 is swung' laterally toward the adjacent side rail of the platen frame to engage the clutch member S5 with the clutch sleeve 84, to drive the line space frame rearwardly, the lever E44 is swung into the position shown in Fig. 5, with the pin. |54 engaged -in the recessv |18., the lever iyielding to allow this movement..

By the action of the lever |56 on the pin |54, the lever |44 and the bail I4 will be held in position to maintain the .engagement of the clutch mem-` ber 86 with the clutch sleeve 84 until the line space frame reaches a predetermined position in its rearward movement. When the bail ||4 is swung away from the adjacent side rail to engage the clutch member 86 with the clutch sleeve 66, the lever |44 is swung into the position shown in Fig. 6,1n which the pin |54 is engaged with the inclined face |10 of the lever |60 and the latter lever is thereby swung into the position shown in said figure. The action of this lever on the pin |54 and the action of the centering device 88 both tend to move the bail back into normal or clutch disengaged position so that the bail must be held in position by the hand lever until it is desired to discontinue the forward movement of the line space frame. Upon the release of the hand lever, the action of the lever |60 on the pin |54 together with the action of the centering device 88 will immediately swing the bail back to normal clutch disengaged position to cause the arrest of the forward movement ofthe line space frame.

As indicated above, when the driving connections for the line space frame have been shifted into rearward drive positions and the line space frame is being driven in a rearward direction, the bail ||4 is located in the position shown in Fig. 5 and said bail and the driving connections are held in position by the action of the detent lever |56 on the pin |54 and lever |44. When the line space frame reaches a predetermined position in its rearward movement, the bail is acted upon by a cam mechanism to restore the same to normal or neutral position and thereby shift the shaft 52 to disengage the clutch 86 from the clutch sleeve 84.

The mechanism for shifting the bail to disengage the clutch when the line space frame reaches the predetermined position in its rearward movement, comprises a cam lblock |66 mounted for sliding adjustment longitudinally on a supporting bar |82 secured to the arms ||6 and |20 in spaced relation thereto by means of studs |84. The cam .block is recessed at |96 to receive the bar |82 and is formed with opposed grooves in which the -bar engages as shown in Fig. 4. The cam block is secured in adjusted position on the bar :by means of a screw |88 `threaded into the block and having its inner end arranged to engage the Ibar, the screw having a knurled or other suitably formed head to enable the same to be turned manually.

The block |80 is provided adjacent its forward end with a cam face |90 arranged to be engaged by a roller |92 mounted on a supporting plate |94 secured to the under side of the left hand bar 6 of the line space frame. When the bail ||4 is swung toward the adjacent side rail of the platen frame to engage the clutch mechanism for driving the line space frame rearwardly, the -block |80 isrmoved in a corresponding direction with the bail to carry the cam face |90 into the path of the roller |92. As the line space frame reaches a predetermined position in its rearward movement, `the roller |92 engages the cam face |90 of the block and the bail is thereby swung outwardly away from the adjacent side rail of the platen frame to carry the longitudinally movable shaft 52 into neutral position. During this movement of the bail, the detent lever |56 yields against the action of the spring |64 and the leverV |44 is restored to the neutralposition shown in Fig. 4, with the pin |54'engaging between the inclined face |10 of the lever |60 and the left hand face of the projection |16 on the lever |56. By adjusting the blockrlll along the bar |82, the block may be located to shift the bail ||4 to disconnect the rearward drive at any desired point in the rearward movement of the line space frame within the range of adjustment of said block.V

It may happen through accident or intent, that the line space frame is moved rearwardly far enough to carryfthe roller |92 back of the cam .block |80. In order that the block may not then obstruct the forward movement of the frame, the block is provided withea cam face |96 for engagement with the roller |92 to shift the block out of obstructing position.

It may also happen that, with the line space frame in a position tolocate the roller |92 behind the cam block |80, the hand lever |30 is operated to engage the driving connections to drive the line space frame rearwardly. In order to prevent the carriage from being moved back to its limiting position and stopped` with the driving connections still engaged, a member |98 is xed to the arm ||6 and is provided with a cam face 200 to be engaged lby the roller |92 to swing the bail H4 outwardlyY and thereby disconnect the driving connections under these conditions.

The shaft 52 is slidably and rotatably mounted at one end in a bearing 202 formed on the side bar 6 of the line space frame and adjacent its other end is slidably and rotatably mounted in a bearing 204 carried .by an arm 206 secured to the upstanding arm 68 on the bracket 69, as shown in Fig. 1. Y

With the control -bail I|4 adjusted to connect the clutch mechanism for driving the line space frame rearwardlyv `and heldin position by the engagement of the pin |54 in the recess |18 in the lever |56, the bail may be shifted manually to disconnect the clutch mechanism and thereby cause the stoppage of the rearward movement of the line space frame by swinging the hand lever |30 downwardly ,from the position B to the intermediate position. Upon this downward movement of the hand lever, the retaining lever |56 will yield to allow the lever |44 to swing from the position shown in Fig. 5 to the neutral position shown in Fig. 4.

In order to limit the distance that the line space frame may be driven forwardly by the holding of the control lever |39 in the position A, a cam plate 208 is mounted-on the forward end of the bail ||4 and is arranged to be engaged 4by the roll |92 at a predetermined point in the foiward movement of the line space frame. The bail then occupies its outer position as shown in Fig. 6 and the engagement of the roll with the cam plate 208 will swing the bail back to its neutral position to disengage the clutch mechanism 'for driving the line space frame forwardly.

It is to be understood that the invention is not limited to the particular construction and arrangement of parts of the illustrated embodiment of the invention, but that the invention may be embodied in other forms within the scope of the claims.

Having explained the nature and object of the invention and having specifically described a construction embodying the invention in its preferred form, what is claimed is:

1. A typewriting machine comprising a substantially flat platen, type mechanism, a supporting frame cooperating with the platen, a shiftable frame for supporting the type mechanism mounted on the rst frame and movable forwardly and ing connections for operating the shiftable frame from the motor, a single manually operable member movable in opposite directions from a neutral position, mechanism constructed and arranged to be operated by the movement of said member in one direction to engage the connections to move the shiftable frame forwardly and to be operated by the movement of said member in the opposite direction to engage the connections to move the shiftable frame rearwardly, the latter mechanism being also constructed to be operated by the movement of said member in the latter direction, when the shiftable frame is being driven rearwardly, to disengage said connections at any .point in the rearward movement of the latter frame, means for retaining said connections engaged while said member is released to drive the shiftable frame rearwardly until the latter frame reaches a predetermined position in its rearward movement and mechanism for automatically disengaging said connections when the latter frame reaches said position.

2. A typewriting machine comprising a substantially fiat platen, a frame for the platen, a shiftable frame mounted on the platen frame and movable forwardly and rearwardly thereon with relation to the platen, a power drive for the shiftable frame including a motor and disengageable driving connections for driving the latter frame in opposite directions from the motor, manually operable means comprising a bail movable in one direction to engage the connections to move the latter frame forwardly and movable in the opposite direction to engage the connections to move the latter frame rearwardly and means for controlling said connections upon the release of said manually operable means including a pair of le- A vers acting on the bail, a movable member connected with the bail and moved in one direction upon the movement of the bail to engage the driving connections to drive the latter frame forwardly, said member being moved in the opposite direction upon the movement of the bail to engage the driving connections to drive the latter frame rearwardly, a contact projection carried by said member for engaging both said levers, a cam on one of said levers engaged by the projection upon the engagement of the driving connections to drive the latter frame forwardly and arranged to actuate said member to restore the bail to neutral position upon the release of said manually operable means, a retaining projection on the other lever, having inclined sides, and arranged to be engaged by said rst projection upon the engagement of the driving connections to drive the latter frame rearwardly and to retain the connections engaged and spring means for holding said levers in contact with the projection upon said movable member.

3. A typewriting machine comprising type mechanism, a platen frame, a substantially fiat platen supported on said frame, a line-space frame mounted on the platen frame and movable forwardly and rearwardly thereon over the platen, a power drive for the line-space frame including a motor, gearing on said frame and disengageable driving connections between the motor and said gearing for driving the latter frame in opposite directions, a bail extending forwardly and rearwardly along the platen frame for controlling said connections, a manually operable lever adjacent the forward end of the platen frame, pivoted on a horizontal axis transverse to said frame and connected with the bail for shifting the bail transversely of the platen frame from a neutral position in opposite directions to engage the connections to drive the line-space frame either forwardly or rearwardly alternatively by swinging the lever in opposite directions on its axis, means for yieldingly holding the bail and said driving connections in neutral positions with the driving connections disengaged, mechanism for returning the bail to neutral position upon the release of said lever following its actuation to engage the driving connections to drive the line-space frame forwardly and mechanism for yieldingly retaining the bail and said driving connections in rearward drive positions following the actuation of the lever to engage the driving connections to drive the line-space frame rearwardly, said parts being shiftable back to neutral positions by swinging said lever from rearward drive to neutral position at any point in the rearward movement of the line-space frame.

4. A typewriting machine comprising type mechanism, a fixed frame, a substantially fiat platen, a frame for supporting the type mechanism mounted on the xed frame and movable forwardly and rearwardly thereon over the platen, a power drive for the movable frame including a motor, gearing between the latter frame and the motor for driving the latter frame in opposite directions including disengageable driving connections, means operable manually in one direction from neutral position to engage said connections to drive the latter frame forwardly and in the opposite direction from said position to engage said connections to drive the latter frame rearwardly and from rearward drive positions back to neutral position to disengage said connections, a centering device for yieldingly centering said driving connections in neutral position, and control mechanism arranged to assist said centering device to hold yiledingly the driving connections in neutral position and to retain said driving connections yieldingly in rearward drive position against the action of said centering device and tending yieldingly to restore the connections to neutral position when moved to forward drive position and means for automatically disengaging said driving` connections when the latter frame has been driven rearwardly to a predetermined position.

ELMER L. WISE. 

